Nortel Meridian 1 Administration And Maintenance page 453

Appendix A — 2Mb PRI implementation
Set the switches found on the circuit card as per the requirements of your
specific installation:
Switch SW1—DCHI Configuration
This switch enables/disables the on-board DCHI and sets the operating mode
of the DCHI.
For the U.K., use DPNSS1 mode. For all other countries, use Q.931 mode.
Switch Down (On)
SW 1-1 enable DCHI
SW 1-2 DPNSS1/DASS2
Switch SW2—Carrier Impedance Configuration
This switch sets the carrier impedance to either 120¾ or 75¾. Twisted pair
cable is usually associated with 120¾. Coaxial cable is usually associated
with the 75¾ setting.
Cable Type SW 2-1
75¾ Up (Off)
120¾ Down (On)
Switch SW3—Clock Controller Configuration
This switch enables/disables (H/W) the on-board Clock Controller. SW 3-2
should be disabled if the on-board clock controller is not in use.
Switch Down (On)
SW 3-1 —
SW 3-2 Disabled
Option 11C
Up (Off)
disable DCHI
Q.931
SW 2-2
Down (On)
Up (Off)
Up (Off)
—
Enabled
ISDN BRI Administration and Maintenance
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